Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
trong doanh » trong nganh
thieu sang » chieu sang, thieu khang, hieu lang
hanh trinh » canh tranh, hanh chinh
trinh va » trinh van, trinh vat, trinh ve
va tuong » va thuong, va thong, xa truong
cong dan » cong san, cong tan, huong dan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sang) OR (thieu quang)) - hanh trinh va tuong ((cong dan) or (trong doanh)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu quang)) - hanh trinh va tuong ((cong dan) OR (trong doanh)) van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (thieu quang)) - hanh trinh va tuong ((cong dan) or (trong doanh)) van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (thieu quang)) - hanh trinh va tuong ((cong dan) or (trong doanh)) van ban*.